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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28555
Title: Different twins in the millisecond pulsar recycling scenario: Optical polarimetry of PSR J1023+0038 and XSS J12270-4859
Authors: Baglio, M. C.
D'AVANZO, Paolo 
CAMPANA, Sergio 
Coti Zelati, F.
COVINO, Stefano 
Russell, D. M.
Issue Date: 2016
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 591
First Page: A101
Abstract: We present the first optical polarimetric study of the two transitional pulsars PSR J1023+0038 and XSS J12270-4859. This work is focused on the search for intrinsically linearly polarised optical emission from the two systems. To this aim, we carried out multiband optical (BVRi) and near-infrared (NIR; JHK) photo-polarimetric observations of the two systems using the ESO New Technology Telescope (NTT) at La Silla (Chile), equipped with the EFOSC2 and the SOFI instruments. The system XSS J12270-4859 was observed during its radio-pulsar state; we did not detect a significant degree of polarisation in any of the bands, with 3σ upper limits, for example, of 1.4% in the R-band. We built the NIR-optical averaged spectral energy distribution (SED) of the system, which could be described well by an irradiated black body with radius R<SUB>∗</SUB> = 0.33 ± 0.03 R<SUB>☉</SUB> and albedo η = 0.32 ± 0.05, without the need for further components. Thus, we excluded the visible presence of an extended accretion disc and/or of relativistic jets. The case was different for PSR J1023+0038, which was in its accretion phase during our campaign. We measured a linear polarisation of 1.09 ± 0.27% and 0.90 ± 0.17% in the V and R bands, respectively. The phase-resolved polarimetric curve of the source in the R band reveals a hint of a sinusoidal modulation at the source 4.75 h orbital period, peaked at the same orbital phase as the light curve. The measured optical polarisation of PSR J1023+0038 could, in principle, be interpreted as electron scattering with free electrons, which can be found in the accretion disc of the system or even in the hot corona that sorrounds the disc itself, or as synchrotron emission from a jet of relativistic particles or an outflow. However, the NIR-optical SED of the system built from our dataset did not suggest the presence of a jet. We conclude that the optical linear polarisation observed for PSR J1023+0038 is possibly due to Thomson scattering with electrons in the disc, as is also suggested from the possible modulation of the R-band linear polarisation at the system orbital period. <P />Based on observations made with European Southern Observatory (ESO) Telescopes at the La Silla Observatory under programme ID 094.D-0692(A), (B).The polarization table is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/591/A101">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/591/A101</A>
URI: http://hdl.handle.net/20.500.12386/28555
URL: https://www.aanda.org/articles/aa/abs/2016/07/aa28383-16/aa28383-16.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201628383
Bibcode ADS: 2016A&A...591A.101B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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